﻿import java.util.Scanner;

public class code041{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		System.out.println("请输入年份)");
		int nf = input.nextInt();
		System.out.println("请输入月份)");
		int yf = input.nextInt();
		
		switch(yf){
		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:
			System.out.println("31天");
			break;
		case 4:
		case 6:
		case 9:
		case 11:
			System.out.println("30天");
			break;
		case 2:
			if(nf%4==0&&nf%100!=0||nf%400==0){
				System.out.println("28天");
			}else{
				System.out.println("29天");
			}
			break;
		default:
			System.out.println("输入有误");
		}
		
	}
}